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Ink jet ink composition

a technology of ink jet and composition, which is applied in the direction of inks, coatings, mixing, etc., can solve the problems of poor water fastness, poor smear resistance, and low optical density of plain paper, so as to improve waterfastness, improve print durability and stability, and improve waterfastness.

Inactive Publication Date: 2006-04-25
EASTMAN KODAK CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]It has been found that this ink jet ink composition, when printed, provides an image which has improved waterfastness, lightfastness, print durability and stability towards pollutants such as ozone and has improved firability through an ink jet printhead.

Problems solved by technology

Although there have been many recent advances in the art of dye-based ink jet inks, such inks still suffer from deficiencies such as low optical densities on plain paper and poor light-fastness.
When water is used as the carrier, such inks also generally suffer from poor water fastness and poor smear resistance.
However, the pigment inks tend to be unstable and settle out from the liquid vehicle over a long storage time.
In addition, some pigment based inks are not as stable as expected towards pollutant.
Pigment inks also have a tendency to clog the orifices of the printhead resulting in deterioration of print quality.
However, there is a problem with this ink using such dendritic polymer as a dispersant in that the ink has a tendency to clog the nozzles of the printhead,

Method used

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examples

[0082]The following hyperbranched polymers having hydrophilic end groups were used in the present invention:

Hyperbranched Polymer 1 (HB-1):

[0083]Hyperbranched polyamide with amine and acid end groups was prepared by high temperature polymerization of tris(2-aminoethyl)amine (2 molar equiv.) and succinic acid (1 molar equiv.) in water according to the process described in copending application U.S. Pat. No. 09 / 919,097 filed Jul. 30, 2001. The Tg of the polymer is ca. 54° C.

Hyperbranched Polymer 1 (HB-2):

[0084]Hyperbranched polyamide with amine and acid end groups was prepared by high temperature polymerization of tris(2-aminoethyl)amine (2 molar equiv.) and 1,4-cyclohexanedicarboxylic acid (1 molar equiv.) in water according to the process described in copending application U.S. Pat. No. 09 / 919,997, filed Jul. 30, 2001. The Tg of the polymer is ca. 65° C.

Hyperbranched Polymer 3 (HB-3):

[0085]Bolton® H20, a hyperbranched polyester with OH end groups obtained from Perstorp, Inc. The mol...

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Abstract

An ink jet ink composition comprising water, a pigment, a humectant and a hyperbranched polymer having end groups consisting essentially of hydrophilic moieties, said hyperbranched polymer having the following formula:HB—Xgwherein:HB is a hyperbranched polymer core;X is a hydrophilic end group; andg is an integer of at least 2.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]Reference is made to commonly assigned, U.S. patent application Ser. Nos:[0002]U.S. Ser. No. 09 / 956,729 by Chen et al., filed 20 Sep. 2001, entitled “Ink Jet Printing Method”.[0003]U.S. Ser. No. 09 / 957,558 by Wang at al., filed of even date herewith, entitled “ink Jet Ink Composition”;[0004]U.S. Ser. No. 09 / 957,548 by Chen et al., filed 20 Sep. 2001, entitled “Ink Jet Printing Method”;FIELD OF THE INVENTION[0005]This invention relates to an ink jet ink composition comprising a pigment and a hyperbranched polymer having hydrophilic end groups.BACKGROUND OF THE INVENTION[0006]Ink jet printing is a non-impact method for producing images by the deposition of ink droplets in a pixel-by-pixel manner to an image-recording element in response to digital signals. There are various methods which may be utilized to control the deposition of ink droplets on the image-recording element to yield the desired image. In one process, known as continuous in...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09D11/10C08L33/02C08L37/00C08L67/00C08L77/00C09D11/00
CPCC09D11/326C09D11/30
Inventor WANG, JIN-SHANCHEN, HUIJUAN
Owner EASTMAN KODAK CO
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